I'm seeing this issue on a retina Macbook. Graphics seem to be rendering @ 1/4 resolution (including clipping regions etc), though touch events are working at the full resolution (which means that clicks don't line up with visual elements).

I've also problems to use the player on a Macbook Pro Retina.The game screen will be presented very small in a huge player window (you can't resize the window). I can't even simulate touches (button presses). When I try it on my Mac Mini, it works great.